#include<bits/stdc++.h>
#define ONLINE_JUDGE
#define ll long long
#define ull unsigned long long
using namespace std;

const int N = 1e6 + 10, INF = 0x3f3f3f3f;

int n;
int a[N];
int pre[N], suf[N];

void solve()
{
    cin >> n;
    pre[0] = INF, suf[n + 1] = -INF;
    for (int i = 1;i <= n;i++) cin >> a[i];
    for (int i = 1;i <= n;i++) pre[i] = min(pre[i - 1], a[i]);
    for (int i = n;i >= 1;i--) suf[i] = max(suf[i + 1], a[i]);

    for (int i = 1;i <= n;i++) {
        if (a[i] == min({ a[i],pre[i],suf[i] }) || a[i] == max({ a[i],pre[i],suf[i] })) cout << 1;
        else cout << 0;
    }
    cout << '\n';
}

signed main()
{
    // ios::sync_with_stdio(0);
    // cin.tie(0);cout.tie(0);
#ifndef ONLINE_JUDGE
    std::istringstream in(R"()");
    std::cin.rdbuf(in.rdbuf());
#endif
    int T = 1;
    cin >> T;
    for (int i = 1;i <= T;i++) {
        solve();
    }
}